| 摘要 |
PROBLEM TO BE SOLVED: To provide a hula hoop sounding by rotation or the like, of wide application and further capable of varying the sound in volume or pitch to be used in various different ways. SOLUTION: The hula hoop 10 comprises partitions 14 in the body 10A thereof to partition the same at predetermined intervals and constitute therein a plurality of resonant chambers 18 continuously arranged in series along the longitudinal direction. Each of the resonant chambers 18 comprises an air inlet 12 provided adjacent to one of the partitions 14 defining the same on the inner side of ring of the body 10A and an air outlet 16 adjacent to the other partition 14 on the outer side of the ring. COPYRIGHT: (C)2005,JPO&NCIPI
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